Blamed for health problem

I’m really seriously considering divorce after this.

My baby will be born with a heart defect.... a severe one. It’s been a difficult and trying time for everyone close to me involved.

My partner and I had a disagreement that started on me wanting to get a therapy dog both for myself and to use for our baby (and unfortunately if the worst happens as I hate to say)

While I let this drop and I was really listening to his remarks and being receptive he suddenly completely changed gears, deflected, and decided to tell me how terrible I am for forcing decisions on him. Like suddenly told me he didn’t even want a child.... AND then that I am the cause of the baby’s heart defect that this is something I did in my pregnancy with our various fights about things.

I’m in shock. I’m so heartbroken words can’t even describe. I’m also sooooo raging angry. I had no idea he felt this way and thought our fights were bad st times, but still “normal” pregnancy I thought. I had no idea he felt this way and feel like I married a monster. I just told him how much I loved him last night. I would maybe be able to chalk it up to a fight but how he said it so defeated... so hopeless.. so deeply disgusted with me I can tell he meant it. I just am beside myself because for now I have to stay with him due to the baby’s condition. I’m trying to pull it together so I don’t give myself contractions. I feel enormous guilt for my babies condition, although I didn’t do anything “wrong”. I’ve had such bad depression although I’m trying to be positive, this is just a cut to my soul.

Am I being unreasonable for telling him I won’t forgive him? Am I being unreasonable for considering divorce?